These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
July 10, 1991 - Boris Yeltsin took the oath of office, becoming the first popularly elected president in Russia's thousand-year history. Birthday - Theologian and founder of Presbyterianism, John Calvin (1509-1564) was born in Noyon, France.